Determination and abatement of methanogenic inhibition from oleic and palmitic acids

Li Jie Wu, Takuro Kobayashi, Yu You Li, Kai Qin Xu, Yongkang Lv

Research output: Contribution to journalArticlepeer-review

15 Citations (Scopus)

Abstract

Long chain fatty acids (LCFAs) are the intermediates from anaerobic digestion of lipid-rich waste, and limit the digestion even at millimolar concentrations. The digestion characteristics of unsaturated and saturated LCFAs, represented by oleic and palmitic acids, are investigated. Consequently, palmitic acid was far less inhibitory than oleic acid. Palmitic acid was almost not degraded before 20 d, and the subsequent methane was also produced at a lower rate, below a half for oleic acid. The heterogeneity between methanogenic sludge and palmitic acid was the likely reason. The abatement methods of soluble calcium addition and bentonite addition were synchronously compared to evaluate the effectiveness in upgrading the anaerobic performance of LCFAs. Limited improvement for palmitic digestion was observed. In contrast, calcium addition was more effective than bentonite addition in shortening lag-phase time, reducing reagent dosage, and decreasing solid concentration of digestate. Delaying the addition time of calcium salt had a negative effect on the abating the inhibition caused by oleic acid. The methanogenic activity decreased exponentially with the addition time of calcium salt, following the equation: Methanogenic activity (%) = 91.0e−t/942.5+24.8e−t/6.2−15.9.

Original languageEnglish
Pages (from-to)10-16
Number of pages7
JournalInternational Biodeterioration and Biodegradation
Volume123
DOIs
Publication statusPublished - 2017 Sep

Keywords

  • Bentonite
  • Calcium
  • Exposure time
  • Mesophilic digestion
  • Oleic acid
  • Palmitic acid

ASJC Scopus subject areas

  • Microbiology
  • Biomaterials
  • Waste Management and Disposal

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